2-Aminothiazole → 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-N-thiazol-2-yl-propionamide

HRID 398445Notes

Reaction equation

HRID 398445 reaction equation
C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.BrN1C(=O)CCC1=O.[CH:28]1([CH2:33][CH:34]([C:38]2[CH:43]=[CH:42][C:41]([S:44]([CH3:47])(=[O:46])=[O:45])=[C:40]([N+:48]([O-:50])=[O:49])[CH:39]=2)[C:35]([OH:37])=O)[CH2:32][CH2:31][CH2:30][CH2:29]1.[NH2:51][C:52]1[S:53][CH:54]=[CH:55][N:56]=1>C(Cl)Cl>[CH:28]1([CH2:33][CH:34]([C:38]2[CH:43]=[CH:42][C:41]([S:44]([CH3:47])(=[O:45])=[O:46])=[C:40]([N+:48]([O-:50])=[O:49])[CH:39]=2)[C:35]([NH:51][C:52]2[S:53][CH:54]=[CH:55][N:56]=2)=[O:37])[CH2:32][CH2:31][CH2:30][CH2:29]1

Participants

6

Reactant 4

HCID 21552-AminothiazoleHCID 11776TriphenylphosphineHCID 67184N-bromobutanimideHCID 120105413-Cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionic acid

Product 1

HCID 120889203-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-N-thiazol-2-yl-propionamideYield 52%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
0 °C

Procedure

A solution of triphenylphosphine (138 mg, 0.53 mmol) in methylene chloride (2 mL) was cooled to 0° C. and then slowly treated with N-bromosuccinimide (94 mg, 0.53 mmol) in small portions. The reaction mixture was stirred at 0° C. for 10 min and then treated with 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionic acid (150 mg, 0.44 mmol). The resulting reaction mixture was stirred at 0° C. for 5 min and then allowed to warm to 25° C. where it was stirred for 25 min. The reaction mixture was then treated with 2-aminothiazole (97 mg, 0.97 mmol). The resulting reaction mixture was stirred at 25° C. for 15 h. The crude reaction mixture was directly purified by flash chromatography, (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate), to afford 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-N-thiazol-2-yl-propionamide (96 mg, 52%) as a pale yellow solid: mp 121-124° C.; FAB-HRMS m/e calcd for C18H21N3O5S2 (M+H)+ 424.1001, found 424.1000.

Workup

  1. customThe resulting reaction mixture
  2. stirringwas stirred at 0° C. for 5 min
  3. temperatureto warm to 25° C. where it
  4. stirringwas stirred for 25 min
  5. customThe resulting reaction mixture
  6. stirringwas stirred at 25° C. for 15 h
  7. customThe crude reaction mixture
  8. customwas directly purified by flash chromatography, (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate),

Sources & evidence

ORD record
ord-bbc1d344a1da42fba369801b525d4edc
Source dataset
uspto-grants-2003_08
Patent number
US06610846B1

Reaction notes

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